>By the time we rewrite it for WM 8.0 MSFT will have WM 9.0 which will not be compatible with WM 8.0
>
>>So rewrite it
>>
>>>Are you talking about Windows Mobile 6.5? If so, I have another beef with MS on that. I have super nice application developed (I speced it and another developer wrote it) written in C# for WM 6.5. But when they moved to WM 7.0, 7.5, and 8.0 my application is not compatible. Which is a big pain. In fact I have hundreds of customers who would buy Windows Phone 8 (if it were to run my app) just for the app alone. So it is loss-loss for both.


I found the following on a blog post from the MS phone team:

Windows Phone 8, although built on a different code base than Windows Phone 7, will still run Windows Phone 7 and 7.5 (Mango) applications without any updating. But to take advantage of Windows Phone 8-specific functionality, like 3D programs using XNA, part of those programs will need to be rewritten.

Notice the "will still run Windows Phone 7 and 7.5 (Mango) " assertion. So update you app and it will be legacy enabled for future phone versions...